Question 1187521


{{{xy=-3}}}

Solve the equation for {{{y}}}:

{{{y=-3/x}}}

Now ask yourself: 
If I choose an {{{x}}}, do I ever get {{{two}}}{{{ different}}} numbers for {{{y}}}? If the answer is {{{NO}}}, the {{{y}}} is a function of{{{ x}}}.

In this case the answer {{{IS}}} {{{NO}}}, so, {{{y}}} {{{IS}}} a function of {{{x}}}.  Each value of {{{x}}} corresponds to a {{{single}}} value of{{{ y}}}.